#include<iostream>
struct travel_time
{
	int hours;
	int mins;
};
const int Mins_per_hr=60;

travel_time sum(travel_time tl,travel_time t2);
void show_time(travel_time t);

int main()
{
	using namespace std;
	travel_time day1={5,45};
	travel_time day2={4,55};
	
	travel_time trip=sum(day1,day2);
	cout<<"Two-day total: ";
	show_time(trip);
	
	travel_time day3={4,32};
	cout<<"Three-day toal: ";
	show_time(sum(trip,day3));
	return 0;
}

travel_time sum(travel_time t1,travel_time t2)
{
	travel_time total;
	
	total.mins=(t1.mins+t2.mins)%Mins_per_hr;
	total.hours=t1.hours+t2.hours+(t1.mins+t2.mins)/Mins_per_hr;
	return total;
}

void show_time(travel_time t)
{
	using namespace std;
	cout<<t.hours<<" hours, "
		<<t.mins<<" minutes\n";
}
